1,721,014 research outputs found
Passive RFID-based Localization System for First Responders
No full textEmergency services in indoor environments can take advantage of local positioning systems. A simple but reliable localization system based on passive RFID technology is here proposed. It resorts to ad-hoc designed antennas for tags, low radiated power and simple localization algorithms. A theoretical model of the system has been developed and tested by means of numerical and experimental analysis. The system allows a moving user handling an interrogating device to localize himself with respect to a grid of fixed tags used as reference anchors. Experimental results show both the feasibility and the reliability of the proposed system
A numerical filter to remove the field scattered by the edges of a finite ground plane from measured data
No full textThe measurement of the field radiated from an antenna
placed above a finite ground plane experiences the effects of the field
scattered by the edges of the ground plane. A new numerical method
to remove these effects from measured data is presented here. It resorts
to the image theorem and can be used for both near-field and far-field
measurements. A simple and effective algorithm has been developed
to apply that method to fields described by means of spherical wave
expansion. A numerical validation shows the effectiveness of the
method
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